Medium
Hard
Hardest
100
The spin of a body on its axis
What is rotation
100
What is the very dense region about 300,000km thick on the sun
What is radiative zone
200
What is the central part of the earth below the mantle
What is core
200
What is the visible part of the sun that we can see from earth
What is photo sphere
300
The thin and solid outermost layer of the earth above the mantle
What is crust
300
What is the middle part of the sun called
What is core
400
One complete trip along an orbit
What is revolution
400
What is nuclear fusion?
What is the combination of the nuclei of small atoms to form a large nucleus. Producing energy
400
If gravity pulls on all of the particles in the nebula , why don't nebulas slowly collapse?
What is the answer has to do with the relationship between template and pressure in the nebula
500
The bath that a planet follows as I travels around the sun in space
What is orbit
500
How long has the sun been shining on Earth
What is 4.6 billion years
500
The cloud of gas and dust that formed our solar system
What is solar nebula
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